Title:
Novel Small-Size Directional Antenna for UWB WBAN/WPAN Applications
Author(s):
Maciej Klemm, István Z. Kovcs, Gert F. Pedersen and
Gerhard Tröster
Source:
IEEE Transactions on Antennas and Propagation
Vol./Issue/Date:
Vol. 53, No. 12, December
Year:
2005
Page(s):
3884 - 3896
Keywords:
Body-worn antennas, human body, pulsed antennas,
specific absorption rate (SAR), ultrawide-band (UWB),
wearable antennas, wireless communication.
Abstract:
This paper presents a novel small-size directional antenna
design for ultrawide-band wireless body area networks/wireless
personal area networks applications. The design is based on a
typical slot antenna structure with an added reflector in order to
achieve directionality. The effects of different antenna parameters
and human body proximity on the radiation characteristics are analyzed.
Antenna measurements with an optic RF setup were performed
in order to characterize the small-size antenna far field radiation
pattern. The different structural antenna parameters were
optimized via extensive numerical simulations. Results show that
for frequencies above 3.5 GHz, where the power front-to-back ratio
of the directional antenna is greater than 10 dB, its impedance is
nearly the same as in the free space. It is not the case neither for the
omnidirectional slot antenna nor the monopole antenna next to the
body. Between 3 and 6 GHz performance of the novel directional
antenna, in terms of radiation efficiency and SAR values, is significantly
improved compared to omnidirectional antenna designs.
Document:
Reference Id:
24
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